Don,
Welcome and good luck with the hunt for your Pantera....
Lloyd Butfoy of RBT Transmisions is the World renowned expert when it comes to the ZF. He builds a 6 speed ZF, but as you probably are already aware if you've done any research 'ZF' translates into 'BIG $$'. Even for the 5 speed you are in for about $4.5K, for a basic refresh. When it comes to buying the 6 speed I think it runs around $15K.
You can look up Lloyd at www.RBTTrans.com and pull up more about previous discussions on the ZF by simply doing a 'find' with ZF or 6 speed as keywords on this forum.
Julian
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